How do the heredity and environmental explanations of intelligence differ? Give two arguments for and against the proposition that intelligence is determined by heredity

What will be an ideal response?

* The heredity position suggests genetic factors are responsible for intelligence, whereas environmental explanations suggest that the environment in which you were raised determines your level of intelligence.
* For: 1) there is a high correlation between intelligence and familial relationship, 2) the intelligence scores of adopted children tend to correlate more highly with their biological parents than their adopted parents.
* Against: 1) a number of environmental toxins have been linked to lowered intelligence, 2) early stimulation can raise intelligence scores, 3) the average number of correct responses on IQ tests has risen during recent decades.